Our group's solution to the sokoban problem

sokoban.rb

@level1 = [
  ['#', '#', '#', '#', '#', '#', '#', '#'],
  ['#', ' ', ' ', ' ', ' ', ' ', ' ', '#'],
  ['#', '.', ' ', ' ', ' ', 'o', '@', '#'],
  ['#', ' ', ' ', ' ', ' ', ' ', ' ', '#'],
  ['#', '#', '#', '#', '#', '#', '#', '#']
]

def input_allowed?(input)
  allowed = %w{w a s d q}

  if allowed.include?(input)
    return true
  else
    puts "Accepted keystrokes are 'w' (up), 'a' (left), 's' (down), 'd' (right), and 'q' (quit). Unaccepted input gets the rack >:D"
    return false
  end
end

def a
  person_row = nil
  person_index = nil

  @level1.each do |row|
    person_row = row
    person_index = row.index("@")
    break if person_index
  end

  if person_index <= 1
    puts "Cannot move left"
    return
  end

  object_at_left = person_row[person_index - 1]

  case object_at_left
  when '#'
    return puts "Cannot move left; there's a wall there"
  when 'o'
    object_two_to_left = person_row[person_index - 2]
    case object_two_to_left
    when '#'
      return puts "Cannot move left; there's a wall there"
    when ' '
      person_row[person_index - 2] = 'o'
      person_row[person_index - 1] = "@"
      person_row[person_index] = " "
    when '.'
      person_row[person_index - 2] = '*'
      person_row[person_index - 1] = "@"
      person_row[person_index] = " "
      return :victory
    end
  end
end



# Start the game!
################

@level1.each do |row|
  puts row.join('')
end

while input = gets.chomp
  next unless input_allowed?(input)

  break if input == "q"

  victory = send(input)

  @level1.each do |row|
    puts row.join('')
  end

  if victory == :victory
    puts "VICTORY!!!"
    break
  end
end